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Nov. 26, 1929. N. K. TURNBULL GALVANIZING BATH Filed June l5. 1928 MNHN? un l, l- WMM MNHN!" I 5. l L 1H. 1.... l

l L Il HI Patented Nov. 26, 1929 UNITED STATES NICHOLAS KING TUBNBULL, F MILLPORT, SCOTLAND GAL'vANIzING BATH Application led June 13, 1928, Serial No. 284,937, and in Great Britain June 14, 1927.

This invention relates to baths for galvanizing articles such as wire, Wire nett-ings, sheets, tubes and other products in which zine or spelter (hereinafter referred to as zinc) covers a layer of heavier metal such as lead (hereinafter referred to `as lead) to which the heat is applied.

The invention is particularly concerned With galvanizing baths of the type in which the bath is heated internally. In connection with baths of this type experience has shown that the consumption of fuel is unduly heavy and, as a result of experimental research, it has been ascertained that the relatively heavy fuel consumption is due to the circumstance that the lead parts with its heat to the zine relatively slowly, the rate of transfer of heat being reduced when a layer of dross is interposedbetween the zinc and the lead. In practice, where the output is forced, a

difference in temperature between the lead and the Zinc of about 200 Fahrenheit is usual.

The invention which has for its object to increase the rate of transfer of heat from the layer of lead to the layer of zinc consists broadly in the incorporation in the galvaniz. ing bath of a thermal conductor or conductors which establishes or establish a thermal connection or connections between the layer of lead and the layer of zinc and passes or pass through the interposed layer of dross.

Apparatus constructed in accordance with the invention is illustrated in the accompanysection, and Fig. 2 a cross section.

The apparatus shown com rises a galvanizing bath 1 fitted with eating tubes 2 with each of which is associated an' oil or gas burner 3. Y

With the object ,of increasing the rate of transfer of heat from the layer 4 of lead to the layer 5 of lzine there are incorporated in the galvanizing bath thermal conductors which establish thermal; connection between the layer 4 and the layer 5 and pass through the interposed layer 6 of dross.

The thermal conductors comprise a plurality of metallic bars 7 extending from the bottom of the bath l through the layer 4 and ing drawing in which Fig. 1 is a longitudinal into the layer 5 any desired distance. The

on the bottom of the bath. The bars'and frame may be composed wholly of iron but ythe portions of the bars immersed in the lead may be composed of aluminium suitably joined to the iron.

Desirably, the bars are so constructed as to be readily removable from the bath, being formed for example with hooks 9.

What I claim is A galvanizing bath comprising a lower layer of lead, an upper layer of zinc, an intermediate layer of dross, a thermal conductor passing through said layer of dross and effecting a thermal connection between the entire layer of lead and the entire layer of zinc, said conductory comprising a` plurality of ,vertical metallic bars extending from the bot-tom of the bath through said layer of lead and into said layer of zinc, and a metallic frame immersedV in said layer of zinc and adapted to hold said bars together 'at their upper ends.

In testimony whereof I have signed my name to this specification.

NICHOLAS KING TURNBULL. 

